Investigate Osmosis :: GCSE Biology Osmosis Coursework

Investigate OsmosisAimTo investigate osmosis. The student is way out to see what happensto the debatet of a spud when it is set into different solutionsof atomic number 11 chlorides and irrigate.Prediction The student predicts that potato lay in distilled water pass on undergo a gain in weight and potato determined in flavor solution willlose weight. Potato placed in mixed c at oncentration will have no falsifyin its weight. This prediction has been made using scientificknowledge of the supernumerary type of diffusion known as osmosis. Inosmosis, each various(prenominal) cell is surrounded by a cell membrane. Thecell membrane al wiped out(p)s small molecules to pass through it, but not largeones.Osmosis is the run of water molecules from an knowledge base of highconcentration (weak solution) to an area of low water concentration(strong solution) through a partially permeable membrane.Water go aways in both directions to try and make the concentrations deep down and ou tside of the cell even. If thither is much movement oneway, it is said that there is a dough movement of water into the areawhere there is less water.If the potato is placed into distilled water, the concentration ofwater outside of the cell will be great than the concentration ofwater inside the cell. There will be a net movement of water from thearea of high concentration to the area of low concentration and as aresult of this the cell will contain more water, it will become turgidand weigh more than it did when it had a smaller concentration ofwater.If the potato is placed into a salt solution the concentration ofwater will be greater inside the cell than outside, osmosis will takeplace and the water will once again move from the area of highconcentration (inside the cell) to the area of low concentration(outside the cell). This will cause the potato to lose weight as itloses its water.If the potato is placed in a mixed solution whence the concentrationsinside and outside of the cell should be equal, the water moleculeswill move by osmosis but the concentrations will remain equal.Apparatus- 125ml of 1ml sodium chloride solution.- 125ml distilled water.- 15 cylinders of potato each calculation 5.3g.- 15 beakers (150ml).- 2 measuring cylinders (50ml)- 2 potato stone drills (one large one small).- 1 set of digital weighing scales.- 1 calculator- 1 small scalpel- 1 stop timeMethod The student will use a potato borer to cut out 15 cylinders ofpotato to the same size and weigh them, the weights will be recordedin the table of results (each piece of potato should be the same